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X. S. Luo,J. Li,Y. L. Jin,C. P. Hu,D. Jia,S. P. Zhan,Y. Yu,M. Hua,H. T. Duan 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
Tribological properties of AlCoCrCuFeNi high-entropy alloy were studied after annealing at various temperatures. X-raydiffraction, scanning electron microscopy, energy dispersive spectroscopy, microhardness tester and pin-on-disc tribometeranalyses were performed to reveal the microstructure, composition, microhardness and tribological behavior variations. Withthe heat treatment temperature increasing, time taken for friction coefficient going through the rapidly dropping down andthen into the stable period increases, the white sheets structures and their size in dendrite area of the AlCoCrCuFeNi alloybecomes bigger, however BCC content declined dramatically. Then, the average friction coefficient of the AlCoCrCuFeNi/Si3N4 sliding friction pair increase from 0.037 to 0.115, and the pin wear loss increase from 3 to 11 μm.
Namkung, H.,Hu, X.,Kim, H.T.,Wang, F.,Yu, G. Elsevier Scientific Pub. Co 2016 Fuel processing technology Vol.149 No.-
Ash adhesion and elimination in the gasification process is one of the main challenges in maintaining a continuous operation of the plant. The properties of ash adhesion and elimination are mainly related to particle sintering behavior. Different sintering behaviors of Shenhua coal ash (SCA) and rice straw ash (RSA) below the inherent initial deformation temperature (IDT) were observed by using optical heating stage microscope (OHSM) under CO<SUB>2</SUB> and Ar environments. The particle interaction of the RSA, the IDT of which was lower than that of SCA, was higher than that of SCA at the same temperature. Adding RSA to the SCA was an effective means of increasing particle sintering of SCA. The sintering reaction rate of ash particles highly increased at beginning of sintering stage. The effects of inorganic chemicals in the sintering process were evaluated by using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) and typical fouling indices. The Ca and K were predominant contributors to the increase in sintering. The degree of sintering through the experiments was compared to a modified Frenkel sintering model, which accurately simulated the sintering tendency under isothermal conditions.
X. Hu,X. Zhang,X. Lou,X. Meng,J. Zhang,T. Li,S. Pan 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The increasing amount of the integration of distributed generations (DG) will bring about some adverse effects on the static and transient voltage stability, or even threaten the reliability and the safety of the whole power grid. The integration capacity of DGs is the main fact that contributes to the impact on the voltage stability. As DGs are connected to the grid through electronic interface, different kinds of control methods affect voltage stability significantly as well. This work mainly focuses on the DG integration to Yuhang power grid, and the outside part of this grid can be equivalent to a Thevenin circuit. The analytic expressions of the voltage and the power penetration rate at the DG connected node are derived. On this basis, the stability characteristics of the load voltage under different DG penetration rates are analyzed. Moreover, the effects of different reactive power control strategies on voltage static stability are compared with each other, and the transient voltage stabilities under different DG penetration rates are also discussed. Finally, the allowed penetration rate for Yuhang power grid is determined after checking the static and transient stability. The results show that the system can support more loads if the penetration of DG is increased appropriately.
X. T. Hu,Y. W. Wan,R. Jiang,Y. D. Song 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
Foreign object damage (FOD) is a common accident that happens in aeroengines, especially in fan and compressor blades. Accurate prediction of the fatigue strength of the fan/compressor blade materials following FOD is important for the repair and maintenance of aeroengines. This paper was based on the experiment part of Ref. [13], and fatigue strength prediction of TC4 alloy following simulated FOD was carried out by the theory of critical distances (TCD). The FOD notch bottom morphology was characterized by structured light scanning, and a superimposed notch model containing the characteristic of FOD contour was proposed for fatigue prediction. The results show that the prediction based on the FOD macro size overrates the fatigue strength. This overrated prediction is mainly caused by ignorance of the irregular local defects at the FOD notch bottom. By taking the local defects into consideration, the superimposed notch model can effectively improve the prediction accuracy of fatigue strength, and the relative error is within ±30 %.
Hu, X -T,Zhang, F -B,Fan, Y -C,Shu, X -S,Wong, A H Y,Zhou, W,Shi, Q -L,Tang, H -M,Fu, L,Guan, X -Y,Rha, S Y,Tao, Q,He, C Macmillan Publishers Limited 2009 Oncogene Vol.28 No.26
Located at the important tumor suppressor locus, 3p22, PLCD1 encodes an enzyme that mediates regulatory signaling of energy metabolism, calcium homeostasis and intracellular movements. We identified PLCD1 as a downregulated gene in aerodigestive carcinomas through expression profiling and epigenetic characterization. We found that PLCD1 was expressed in all normal adult tissues but low or silenced in 84% (16/19) gastric cancer cell lines, well correlated with its CpG island (CGI) methylation status. Methylation was further detected in 62% (61/98) gastric primary tumors, but none of normal gastric mucosa tissues. PLCD1 methylation was significantly correlated with tumor high stage. Detailed methylation analysis of 37 CpG sites at the PLCD1 CGI by bisulfite genomic sequencing confirmed its methylation. PLCD1 silencing could be reversed by pharmacological demethylation with 5-aza-2′-deoxycytidine, indicating a direct epigenetic silencing. Ectopic expression of PLCD1 in silenced gastric tumor cells dramatically inhibited their clonogenicity and migration, possibly through downregulating MMP7 expression and hampering the reorganization of cytoskeleton through cofilin inactivation by phosphorylation. Thus, epigenetic inactivation of PLCD1 is common and tumor-specific in gastric cancer, and PLCD1 acts as a functional tumor suppressor involved in gastric carcinogenesis.Oncogene (2009) 28, 2466–2475; doi:10.1038/onc.2009.92; published online 18 May 2009
Ma, R. C. W.,Hu, C.,Tam, C. H.,Zhang, R.,Kwan, P.,Leung, T. F.,Thomas, G. N.,Go, M. J.,Hara, K.,Sim, X.,Ho, J. S. K.,Wang, C.,Li, H.,Lu, L.,Wang, Y.,Li, J. W.,Wang, Y.,Lam, V. K. L.,Wang, J.,Yu, W.,Ki Springer-Verlag 2013 Diabetologia Vol.56 No.6
<P><B>Aims/hypothesis</B></P><P>Most genetic variants identified for type 2 diabetes have been discovered in European populations. We performed genome-wide association studies (GWAS) in a Chinese population with the aim of identifying novel variants for type 2 diabetes in Asians.</P><P><B>Methods</B></P><P>We performed a meta-analysis of three GWAS comprising 684 patients with type 2 diabetes and 955 controls of Southern Han Chinese descent. We followed up the top signals in two independent Southern Han Chinese cohorts (totalling 10,383 cases and 6,974 controls), and performed in silico replication in multiple populations.</P><P><B>Results</B></P><P>We identified <I>CDKN2A/B</I> and four novel type 2 diabetes association signals with <I>p</I> < 1 × 10<SUP>−5</SUP> from the meta-analysis. Thirteen variants within these four loci were followed up in two independent Chinese cohorts, and rs10229583 at 7q32 was found to be associated with type 2 diabetes in a combined analysis of 11,067 cases and 7,929 controls (<I>p</I><SUB>meta</SUB> = 2.6 × 10<SUP>−8</SUP>; OR [95% CI] 1.18 [1.11, 1.25]). In silico replication revealed consistent associations across multiethnic groups, including five East Asian populations (<I>p</I><SUB>meta</SUB> = 2.3 × 10<SUP>−10</SUP>) and a population of European descent (<I>p</I> = 8.6 × 10<SUP>−3</SUP>). The rs10229583 risk variant was associated with elevated fasting plasma glucose, impaired beta cell function in controls, and an earlier age at diagnosis for the cases. The novel variant lies within an islet-selective cluster of open regulatory elements. There was significant heterogeneity of effect between Han Chinese and individuals of European descent, Malaysians and Indians.</P><P><B>Conclusions/interpretation</B></P><P>Our study identifies rs10229583 near <I>PAX4</I> as a novel locus for type 2 diabetes in Chinese and other populations and provides new insights into the pathogenesis of type 2 diabetes.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s00125-013-2874-4) contains peer-reviewed but unedited supplementary material, which is available to authorised users.</P>
Effect of Ruthenium on Tensile Properties of a Single Crystal Ni-Based Superalloy
X. P. Tan,J. L. Liu,T. Jin,Z. Q. Hu,홍현욱,B. G. Choi,I. S. Kim,조창용 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.5
The tensile properties of two single crystal Ni-based superalloys with and without added Ru (0 and 3 wt%)were investigated under a constant strain rate of 3.3×10−4/s at 20 °C, 760 °C, 800 °C and 1000 °C, respectively. The deformation mechanisms could be divided into two temperature regimes. From room temperature to 800 °C, the deformation mechanism is caused by the shearing of γ′ particles by anti-phase boundaries (APB) or stacking faults. At 1000 °C, the deformation mechanism is caused by the bypassing of γ′ particles by dislocations. At 20 °C and 800 °C, γ′ particles were sheared by APB. Due to smaller γ′particles, the yield strength was decreased with addition of 3 wt% Ru. Additionally, work hardening is less pronounced in the alloy without Ru, hence the ultimate tensile strength was not decreased with the addition of 3 wt% Ru. At 760 °C, γ′ particles were sheared by stacking faults. Since the formation of stacking faults was promoted, the yield strength was decreased due to a 3 wt% Ru addition. However, the ultimate tensile strength was significantly increased when 3 wt% Ru was added. This is due to the markedly stronger work hardening caused by large numbers of stacking faults. At 1000 °C, deformation occurred by dislocations bypassing γ′ particles. Due to wider γ channels, the yield strength was decreased by 3 wt% Ru addition. Moreover, Alloy 3Ru has smaller γ′ particles and a volume fraction as well as less pronounced work hardening, so the ultimate tensile strength was decreased when 3 wt% Ru was added.